Download MendeleyStructural model for strain-dependent microtubule activation of Mg-ADP release from kinesin.
Nitta, R., Okada, Y., Hirokawa, N.(2008) Nat Struct Mol Biol 15: 1067-1075
- PubMed: 18806800
- DOI: https://doi.org/10.1038/nsmb.1487
- Primary Citation of Related Structures:
2ZFI, 2ZFJ, 2ZFK, 2ZFL, 2ZFM - PubMed Abstract:
Mg-ADP release is considered to be a crucial process for the regulation and motility of kinesin. To gain insight into the structural basis of this process, we solved the atomic structures of kinesin superfamily protein-1A (KIF1A) during and after Mg(2+) release. On the basis of new structural and mutagenesis data, we propose a model mechanism for microtubule activation of Mg-ADP release from KIF1A. In our model, a specific interaction between loop L7 of KIF1A and beta-tubulin reconfigures the KIF1A active site by shifting the relative positions of switches I and II. This leads to the sequential release of a group of water molecules that sits over the Mg(2+) in the active site, followed by Mg(2+) and finally the ADP. We further propose that this set of events is linked to a strain-dependent docking of the neck linker to the motor core, which produces a two-step power stroke.
Organizational Affiliation:
Department of Cell Biology and Anatomy, University of Tokyo, Graduate School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
